SOLUTION: what quantity of water should be taken out to concentrate 65 litres of 54% acidic liquid to 78% acidic liquid

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Question 976071: what quantity of water should be taken out to concentrate 65 litres of 54% acidic liquid to 78% acidic liquid
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +w+ = liters of water to be removed
+.54%2A65+=+35.1+ liters of acid in 54% solution
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+35.1+%2F+%28+65+-+w+%29+=+.78+
+35.1+=+.78%2A%28+65+-+w+%29+
+35.1+=+50.7+-+.78w+
+.78w+=+50.7+-+35.1+
+.78w+=+15.6+
+w+=+20+
20 liters of water must be taken out
( note that no acid is taken out )